Astronomy

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Across
  1. 3. Time when day and night are equal
  2. 5. Natural satellite orbiting the Earth
  3. 9. Light display caused by solar particles
  4. 10. Vast system of billions of stars
  5. 13. Rapidly rotating neutron star emitting radiation
  6. 14. Streak of light from a falling rock
  7. 16. Star at the center of our solar system
  8. 17. Temporary blocking of one celestial body
  9. 18. Luminous ball of gas held by gravity
  10. 19. Curved path of a planet or satellite
Down
  1. 1. Point directly above a specific observer
  2. 2. Icy body that develops a glowing tail
  3. 4. Cloud of gas and dust in space
  4. 6. Distant, high-energy galactic core
  5. 7. Space entirely devoid of any matter
  6. 8. Force attracting objects toward each other
  7. 11. Group of stars or galaxies held together
  8. 12. The red planet in our solar system
  9. 13. Large body orbiting a central star
  10. 15. The universe seen as a whole